94 42 
hairy and more or less scaly by filiform scales, which are distinctly and sharply 
toothed by claw-shaped teeth; the cell-walls very dark and thick, the lumina 
small (fig. 31°). Under-surface often glandular. Segments patent or a little oblique, 
with the edges parallel, the apex truncate or bluntly rounded, entire or finely 
toothed, not mucronate. Veins 10—15, oblique. Sori inframedial, rarely almost 
medial, furnished with a persistent, reddish, glabrous or slightly ciliate and glan- 
dulose indusium. 
From D. falciculata the present species differs by more veins in the patent, 
obtuse segments, inframedial sori and the different shape of the scales; from JD. 
submarginalis it differs by the dark colour of the lamina and scales, obtuse seg- 
ments, inframedial sori and persistent indusia. 
The specimens examined can be referred to two forms: 
1. forma isabellina (Fée). 
Scales of rachis and coste few and small, very like those of D. submarginalis 
f. tenuifolia but darker and more distinctly toothed (fig. 3163); rachis, coste and 
both surfaces hairy by scattered, red, deciduous hairs. Pinnze 2!'/—3 em broad; 
segments rather oblique, finely toothed or often deeply serrate in the lower pinnae. 
Veins 10—12, forked in the serrate segments; sori often nearly medial. — Stipe at 
base with a dense mass of soft, reddish scales. 
This form, to which the original specimen of A. ctenitis Link seems to belong, 
is very closely related to D. submarginalis f. tenuifolia, from which it differs mainly 
by colour, structure of the scales and the persistent indusium. 
Brazil: Rio, Grazrou nr. 2368 (C, H, Rg), 2371 (H), 2372 (H, Rg). 
Minas Geraes: Lagoa Santa, WanMiNG (H) — Caldas, LinpperG nr. 557 (B), MosÉw nr. 2146 pt. 
(B, Rg). 
Sao Paulo: Tieté, GEnDER nr. 84a (R) — Toledo, Scunapp nr. 43 (C). 
2) forma amaurolepis (Fée) — (A. amaurolepis Fée, A. squamigerum Mett., Lastrea 
distans Brack.) 
Larger and more scaly than the preceding form, the scales larger and darker. 
Coste beneath flat and sulcate, furnished with two kinds of scales: 1) lateral ones, 
which are red-brown and patent (fig. 316^), and 2) frontal ones, which are adpressed 
and almost black (fig. 316°). Both surfaces generally glabrous. Pinne 4 cm broad, 
the segments close, patent, obtuse; veins about 15: sori inframedial. — Stipe at 
base apparently without a dense mass of soft scales. 
Between this excellent form and f. isabellina numerous intermediates are to 
be found, the two forms described being the two extremes of D. ctenilis. 
Brazil: Rio, Grazrou nr. 1680, 2370 (H), MosÉN nr. 100 (Rg, S), Martius (Hb. Fl. Brazil nr. 324 (B), 
and others. 
Minas Geraes: T. pE Moura (B). 
Bahia: pu PasquiN 1851 (B). LuscuwaTH nr. 118 (B). 
